The Ion MnO₄^- Is Often Used to Analyze for the Fe²⁺

question 30

Multiple Choice

The ion MnO₄^- is often used to analyze for the Fe²⁺ content of an aqueous solution by using the reaction
MnO₄^- + Fe²⁺ → Fe³⁺ + Mn²⁺
In acidic solution. A 45.6-mL sample of a solution containing Fe²⁺ requires 33.9 mL of a 0.027 M KMnO₄ solution for complete reaction. What is the concentration of the Fe²⁺ in the original solution?

• A) 10.0 × 10^-2 M
• B) 2.0 × 10^-2 M
• C) 3.6 × 10^-1 M
• D) 6.0 × 10^-2 M
• E) 4.0 × 10^-3 M

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